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sei

(C) 1997 Nanami Kurasawa

 

The adult sei whale measures between 12 - 16 meters in length and can weigh between 20 - 30 tons.

The sei whale is distributed globally but is found mainly in offshore temperate waters. They belong to the family Balaenopteridae, possessing plates of baleen that filters small crustaceans, fish as well as small mollusks such as squid and octopus. The sei whale is capable of swimming very fast, but it generally stays close to the surface and can be followed by the so-called "fluke prints" or swirls of water created when the whale beats it's tail. Their pod size is usually about 2 - 5 individuals but it would depend on food availability. Whalers heavily hunted the sei, particularly during the 1960s. As a result of this the population was severely depleted and, despite the whaling moratorium imposed by the International Whaling Commission in 1986, the sei still needs a long time to recover. Various threats still linger which may effect the recovery of the sei population. Among these threats would be pollution, fishing gear entanglement and collisions with boats, and recently, Japan started hunting 50 sei whales in the name of 'scientific research'.

IKAN Guide to Whales Index
Following are cetaceans which are considered inhabitants of Japanese coastal waters.
Inside round brackets are Japanese names.
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porpoises
(nezumiiruka ka)

harbour porpoise (nezumi iruka) / finless porpoise (sunameri) / Dall’s porpoise (ishi iruka)

oceanic dolphins
(mairuka ka)

rough-toothed dolphin (siwahairuka) / bottlenose dolphin (handou iruka) / striped dolphin (suji iruka) / pantropical spotted dolphin (madara iruka) / northern right whale dolphin (semi iruka) / common dolphin (mairuka) / long-beaked common dolphin (hase iruka) / Fraser’s dolphin (Sarawak iruka) / pacific white-sided dolphin (kama iruka) / melon-headed whale (kazuha gondo) / pygmy killer whale (yume gondo) / false killer whale (oki gondo) / orca - killer whale (shachi) / long-finned pilot whale (hirenaga gondo) / short-finned pilot whale (kobire gondo) / Risso’s dolphin (hana gondo)

beaked whales
(akabo kujira ka)

Cuvier’s beaked whale (akabo kujira) / Baird’s beaked whale (tuchi kujira) / Stejneger’s beaked whale (ohgi hakujira) / Hubbs’ beaked whale (habbus ohgi hakujira) / Blainville’s beaked whale (kobuhakujira) / ginkgo-toothed beaked whale (ichou hakujira)


Names of whales without links are under construction. Coming soon.

Reference:

  • About Rare Aquatic Life in Japanese Waters, National Fisheries Agency
  • Red List of Japanese Mammals, Mammalogical Society of Japan
  • Whales and Dolphins, Anthony R. Martin
  • Whales, Dolphins and Porpoises, Mark Carwardine
  • Killer Whales, Ford / Ellis / Balcomb